(x^2)/16+(y^2)/25=z怎么用MATLAB求解使用MATLAB画图

方程组：{x+y-z=6,x+z=16,x-y+2z=17 方程组x+3y-z=17 2x-y+z=16中的y、z同时满足y=z+2,求x、y、z.急! 正数x,y,z满足5x+4y+3z=10求证25x^2/(4y+3z)+16y^2/(3z+5x)+9z^2/(5x+4y)>=5 用行列式的性质证明：y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证? (x-2y+z)(x+y-2z)分之（y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) + (y+z-2z)(x-2y+z)分之（x-z)(y-z)=?第三部分那个是 （y+z-2x)(x-2y+z)分之（x-z)(y-z) 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 9(x+z)2-16(y+z)2=? 2x+y+z=15 x+2y+z=16 x+y+2z=17 解方程组:2x+y+z=15 x+2y+z=16 x+y+z=17 4x-y+z=25,6x-z+2y=22,x+3y+z=-2 {4x-y+z=25,6x-z+2y=22,x+3y+z=-2 蟹蟹 ｛ 5x-3y+z=25x+2y-4z=3-5x+y-z=2 X+Y+Z=20,4X+3Y-Z=14.3X+4Y-2Z=16 (x+y-z)^2-(x-y+z)^2=? (x-y-z)*( )=x^2-(y+z)^2 填空